Keepsake Quilting carries name-brand quality fabrics. I don't think that they identify who the makers are - at least not in their catalog - but I usually recognize the fabrics as having been part of some maker's line. And the people at Keepsake Quilting are very skilled at putting together combinations (medleys) that include various makers.
Keepsake Calicos is just a name that JoAnn Fabrics uses to distinguish their everyday calico line from their novelty group, or their Debbie Mumm fabrics, or their special-purchase-bargain-price fabrics. You'll find that the quality of the Keepsake Calicos is quite variable. Some of the brands that are included in that line-up are made by Classic Cottons, Santee, Fabric Traditions, and MBT (division of Marcus Brothers Textiles). And it also includes others that I have no idea who they're made by.
I would NOT be afraid to order from Keepsake Quilting!